Cabinet for use with sound-reproducing devices



April 79 1925. ly

E. A. GRAHAM CABINET FOR USE WIT SOUND BEFRODUCING DEVICES Filed Aug. v29 924 5 sheisnfsmt 1 @ma m25. 1,532,811

E. A. GRAHAM CABNET FOi USE WITH SGUNT) HEPHODUCING DEVICES Filed Apg.; 29. 1924 -5 sheetsmshfet z xp 79 B925. 1,532,811

' E. A. GRAHAM CABINET FOR USE WITH SOUND REPRODUGING DEW-[ICES Filed Aug; 29. 1924 5 sheets-snm :a

E. A. GRAHAM Ap- 7i, w25. 1,552,811

GBINET FOR USE WITH SOUND REPRODUCING DEVICES Fid ngt 29. 1924 5 sheets-snaai 4 April 7, 1925. y

E. A. GRAHAM CABINET FOR USE WITH SOUND REPRQDUCING DEVICES 5 sheets-Sheet s Filed Aug.V ze. 1924 anni erstes.

i@ .di i

EDWARD ALFIE/ED GRAHAM, F BRQCKLEY, ENGLAND.

CABINET FUR USE WITH SOUND-REPRODUCING DEVICES.

ppieation filed August 29, 1924. Serial Ho. 735,022.

To at? tch/om t't 'may concern.'

it Known that i, EDWARD ALFRED GRAHAM, a subject of the King oi Great and ireland, residing atl irockley, in the county of London, England, have invented improvements in or Relating to Cab inets for Use with Sound-Reproducing Devices, of which the following is a specica tion.

The loud speaking telephones used in connection with wireless receiving apparatus have heretofore been combined with a horn or trumpet (hereinafter called a trumpet) adapted to be supported upon atable or other support for use, no means other than the usual receiver adjusting screw being provided whereby the sound emitted trom the trumpet can be varied or modulated to suit varying requirements. f

` The present invention has for one of it objects to enable the sounds emitted from the trumpet oit a loud speaking telephone to ce varied or modulated.

Another object ot the invention is to provide a. loud sneaking telephone combination oif the hind l:referred to which is more compact and better adapted for convenient use than those heretofore provided and which at the same time may admit of theelhciency ot a contracted acoustic system being made equal to that or the more extended construe? tions oi cabinets or cases and sound conduits generally associated with loud speaking; telephone receivers.

According to the invention, a loud speaktelephone with its trumpet, is enclosed within cabinet provided with a movable panel, cover or door arranged opposite the open mouth ot the trumpet and capable of being moved from and towards the same so as to vary the volume of the sound emitted Trein the trumpet to theroom or place where Y cabinet is placed, and to modulate such is, means being provided, when neceswhereby the position ot the electron ,ffnet ot the telephone receiver in relation 'to the diaphragm of the receiver, can be ad justed to suit requirement from the exterior ci the cabinet. A

rihe trumpet can be made of various shapes as seen in side view and it and the telephone receiver can be variously arranged within the cabinet. Conveniently, the trumpet may be of the kind 'that is bent on itself se that its open flaring outlet end extends the same direction as its inlet end to which the telephone receiver is attached and both ends be located inv or near to a tran-sve'rse plane common to them. Such a loud speaking telephone according to one arrangement, is so arranged within a cabinet that the openend of the trumpet and the telephone receiver are arranged adjacent to one side of the cabinet, the portion of which opposite the open lend of the trumpet, is adapted to form a cover, panel or door Y(hereinafter called tor brevity the cover) which normally forms part of the side of the cabinet andv closes an opening therein opposite the open end of the trumpet. Such a cover may advantageously be carried by sliding rods so that it can be moved outward and inward parallel to itself, by hand, or indirectly by suitable gearing, by a person located near to or at a distance from the cabinet, in the latter case through suitable connecting means, such as pneumatic', electric lor mechanical means. The smaller end of the trumpet carrying the' telephone receiver will, in the arrangement now being described, be arranged opposite a portion of the side of the cabinet that nor mally is not movable and through which may extend adjusting means whereby the relative positions of the electro-magnet and diaphragm of the receiver can be adjusted to suit requirements. 0r the said side portion of the cabinet vmay be provided with an aperture through which an adjusting key can be inserted when desired. The casing et the telephone receiver can be adapted to be secured to the side of the cabinet and serve as the means for supporting the trumpet in position within the cabinet.

In another arrangement the bent trumpet with telephone receiver is so nounted within the cabinet that italar e and small ends are arranged adjacent to t e top of the cahinet which, in this case, is rovided with a cover of the kind hereinbetore referred to.

in another arrangement, the trumpet isv so shaped that its larger open end is adjacent to one side et the cabinet, which is provided vvith a cover as described whilst its smallerend with telephone receiver is adjacent to the top ot' the cabinet. ln this case ie adjusting means for the tele hone receiver may, when necessary exten through the top ot the cabinet, or this may be provided with an aperture adapted to admit of the insertion of an adjust-ing key. In this case also, the casing of the telephone receiver either directly may be adapted to support the trumpet from the top of the cabinet.

In eaeh ease. the inovahle rever oi the eahinet may he. made hollow to serve as a sounding' hoard and he so curved or shaped on its,I inner side as to guide or deflect outward, in any desired direction, the sounds emitted from the trumpet.

lVithin the eahinet iuay he arranged means ol' an),rv known or suitable ltind tor wireless reception, or tor ainplilirin;A the Currents or o eillation paseiner t'roni the Said wireless reeeirina' apparatus. or 'troni external wireless reeeiring apparatus. to the telephone reeeiver.

'lhe Complete closure oi' the rover nia)y he ranSed :uiton'iatiealljY to break the operatingr eirenithv ot the rereiving` t amplifying' den viren used. the opening ot the eorer for a Sniall distance Fufheinj; to cause the eireuits to be remade and the remainder ot the openiii ;finotion Servizi;r to modulate the emitted soiind to any desired degree.

ltllertrie terminals or conneftions are ronreuientl;Y attathed to the Cabinet. l'or connertion ol the telephone receiver or current anipli'tyino' means to external wirelees reeeiving' apparatua.

The aeeoinpauving drawings illustrate several ways in whieh the invention ran he earried into efileet. Fig. l heilig a part :leetional elevation and lfig. 2 a part Seetional plan ot' one arrangement ot eahinet einliodying the invention. Fig. il is ay pei-speetive View ol such a Cabinet Complete. Figs. 4- and 5 are part seetional elevations of two modifications. Fig. 6 is a part sectional plan ot a third nioditieation. Fig. 7 is a perspeetire View of a simple forni of eahinet allowing another horn arrangement, Fia'. 8 in a perspective View ot a eahinet intended to he supported flatwi e against a wall and iria'. 9 is a pei-Sportive View ot a eahinet adapted to lie Supported in tho eorner hetween two Walla. llig. l0 is a vertieal tranaverse l@et-tion throlurli either Fixx. tl or Fig. 5l.

Figs. ll and l2 are perepretire views and Fila'. lf3 a part .Ceeiional plan ot a. preferred eonsftruetion ot trumpet and Sound conduit reeeiver. i

Figs. 14 and i5 are views Similar to Figs. l2 and 7 respeetively ot Yet another horn arrangement and eahinet.

Referring first to Figs. l. 2 and 3, a. is a. trumpet` the mou'th ot which is adjacent to /an opening Z) in the front o at a cabinet d ',and 'havingr an arm e extending through. the Ltop f `ot the cabinet where is located the telephone receiver eeess to the said receiver is obtainable hy the lifting' ot' a cover 71, when the usual adiuatinar member i ean he directly manipulated. rll`ho opening;r o in the trout. o can he. eoinpletely closed` or more or lees opened, hy advancing' and withdrawing a cover y which is provided with rods 7c i esami adapted to slide in tuhular guides m fined within the cabinet. The Cover j., w'l'iieh in this ease is moved direct-ly by hand, is; provided with a portion n which is preferably hollow and Serves as the deleetor-and Sound modulator reterred to. @ne et? the rods 7c (Fig. 2) is shown as provided with an insulating plug o, which works between springs v and serres to separate contacts and breidt any eonvenient. eineuit not re quired until the cover is sniieiently opened, the. springe [i thereafter allowing the contaets yr to rernain engaged, as the cover is further opened.

ln Fig'. l the trumpet has a straigl'ri' arm nl and the telephone receiver g loria-ted within the eahinet, access being hal to the adjusting; member e', as by a irejv", rough the hinged flap s.

.In Fig'. 5 the arm fag ot' the. trununet if; bent round so that. the receiver g is adjacent the 'trout c ot 'the ealiinet, the adjusting' nieinlier protruding' through the latter,

ln Fig. l the trumpet is Shaped shown and aereas is gained to the adjusting; ineinher throluh a flap. as in Fig. l whichV however in located in the side wail fr ol" the rahinet.

Fig. T, which l hows a further modified arrangement. is Felt explanatory.

ln the ease of the hangingr cabinets Shown in Figs. 8 and 9, the trumpet mayl ar ranged as in Fig. 10, the guide rods .7c in Fig. l) and in any other desired instance loein er telescopic it Eutiicient space for solid P- rods is not available.

ln Figs. 11i, 12 and 13 the dared or trumpet Shaped outlet end portion u, of the sound ronduit is of rectangular cross section and ma de ol Wood. The intermediate il Shaped portion a ot' the sound eonduit's of metal. and ot gradually increasingn circular erosie set-tional area trom its inlet end w to its outlet end where it is provided With an enlarged rertanfrnlar portion a: fitting over the inlet. end y ot the flared or trumpet shaped portion ot the Said conduit. The upwardly hentinlet end portion @n of the sound conduit. carrying: the telephonie receiver, is of eire'ular cross Section and may he ribbed or wehhed as at .s to render it comparatively rigid.

The outlet, intermediate and Ainlet portions 1 o, :an ot the, sound conduit are or ma.)Y advantageously he jointed together with the aid of interposed material of a lionsonorous character, as tor instance ruhiger, so that the several portions` shall he aeous tieally insulated trom one another but in l@ome cases. as illustrated. the said upwardly lient inlet end portion w of the sound conduit to which the, telephonie receiver g' is attached, may lie formed as a substantial tubular eiernent of non-sonorous material, as for instance rubber of medium hardness and. ri'

senor-ous material, carried reseau The connection of the horizontally t k ose'd telephone receiver g to the upper end of the upwardly bent inlet portion w of th.; sound conduit, when the latter is not :glo of non-sonorous material, is or may be etieeted'by the aid of a socket or hollow plug, preferably of rubber or equivalent nonhy thev telephonie receiver and fitting over or into the said upper end of the sound conduit. l is a Washer ci rubber separating'the portions 'o and The telephonie combination hereinbefore described may be acoustically insulated as a whole from the casing in which it is disposed, as by the interposition of washers or heitere of non-sonorous n'iaterial such for example as india-rubber or felt.

From Figs. 1A and 15 it will be further shown that other modifications may be readily employed the receiver g in this example i eilig connected to the trumpet shaped por tion t', by a conduit c1 of helico-spiral form which affords a somewhat greater ca paeity 'than `the other forms illustrated. ,Acait from the advantage of greater lei'igth enduit to Which the greater capacity reo. ed to is due, this modification allows of the receiver g being so positioned that access ca he gained from the rear of the cabinet to the means of adjustment for affording the eciency of the electro-magnetic 'closed therein and arranged with the open mouth of the trumpet coincidentfwith an opening in one wall of the cabinet and a, cover arranged opposite the open mouth aforesaid, said cover being constructed to serve as a sounding board and sound defiector and adjustable toward and from said mouth in aplane substantially et right angles thereto so as to vary the volume of the'sound emitted lfrom the trumpet and to modulate Such sounds, substantially as described.

2. A loud speaking telephone according to claim l in which the cover of the cabinet associated with the mouth of the trumpet is made hollow to serve as a, sounding board and sound detlector, substantially as described.

3. A loud speaking'telephone according to claim 1 in which the cover associated with the mouth of the trumpet is mounted to slide, substantially as described.

Signed at London, England, this nine-` teenth day of August, 1924.

EDWARD ALFRED GRAHAM. 

